"Laziness and cowardice are the reasons why so great a portion of mankind, after nature has long since discharged them from external direction, nevertheless remains under lifelong tutelage."

"The American Indians are too weak for hard labor, too indifferent for industry, and incapable of any culture."

"Space and time are not properties of things in themselves, but forms of our intuition."

"The highest good in the world, the final end of all moral effort, is a world in which happiness is distributed in exact proportion to morality."

"Thoughts without content are empty, intuitions without concepts are blind."